Support and General Use > Theming and Appearance Customization
RockBox album cover appearing white'ish
dreamlayers:
--- Quote from: electric_indigo on June 15, 2013, 04:33:54 AM ---Some examples: http://imgur.com/a/5NPCm
Some of them have not only color distorted, but also have some kind of “offset”.
Resizing to player's native resolution fixed the problem for all the images. Converting to bmp and back to jpeg without resizing fixed it for most of them. I used imagemagick with default quality settings.
--- End quote ---
I'm seeing the problems you describe in the image viewer plugin, on the 5G iPod and 5G simulator, d561017. This seems like a JPEG decoder issue.
These weren't fixed by converting to bmp and back: http://i.imgur.com/rmdguNT.jpg http://i.imgur.com/iTHqXDL.jpg
Note that they're both overall dark images, with large fairly uniform areas. The new JPEGs both seem to show some corruption near the top in Rockbox, like the first few rows of blocks aren't decoded properly, and proper decoding starts after a certain point.
Roboturner913:
I've had this issue in the past on encoded on covers with a lot of dark/black colors. It's always the same few covers that do it too.
I think for some reason Rockbox can't handle all of the darkest color info, especially when there are gradients of black. I lightened the cover a bit through Photoscape and that seemed to work. The good news is that once you fix it and re-tag the files it's done for good and you shouldn't have to mess with it again.
Probably the reason bitmapping works sometimes is because you're throwing out a lot of the subtler color info (i.e. instead of 10 shades of black there are now only 2 or 3) so it's not nearly so difficult for the program to read and process.
Nephiel:
I'm also having this issue.
The file I was trying to use as a backdrop for the menus is a very dark figure fading onto a black background. It's a BMP file I resized to 96x96 (the native resolution of the Zip) so no resizing is done by Rockbox. However the figure appears very bright on the screen of the Clip Zip, the edges are very clearly defined, with a high difference in brightness between "pitch black" and "very-nearly-black gray".
Yet on a computer the screen dumps look the same as the original image (black and dark gray look nearly the same brightness), so the bug must be in the OLED screen or its driver...
Nephiel:
Here's a file which appears to be fine on a computer yet shows artifacts when viewed on a Clip Zip. My bad, that image had artifacts indeed.
ZincAlloy:
Some mp3s I got from amazon have embedded album art that will produce blue artifacts.
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